THE INVENTION RELATES TO THE NEW PRODUCTS OF FORMULA (1):IN WHICH:R1 REPRESENTS AN OPTIONALLY SUBSTITUTED CARBOCYCLIC OR HETEROCYCLIC RADICAL R2 AND R3 ARE SUCH THAT ONE REPRESENTS HYDROGEN AND THE OTHER REPRESENTS OPTIONALLY SUBSTITUTED PIPERIDINYL R4 REPRESENTS HYDROGEN, ALKYL OR PHENYL OPTIONALLY SUBSTITUTED, THESE PRODUCTS BEING IN ALL ISOMER FORMS AND THE SALTS, AS MEDICAMENTS.